Protection signalling system having channel impedance alteration means for providing indications of remote station conditions



Oct. 26, 1965 H. G. wHlTl-:HEAD 3,214,734

PROTECTION SIGNALLING SYSTEM HAVING CHANNEL IMPEDANCE ALTERATION MEANS FOR PROVIDING INDICATIONS OF REMOTE STATION CONDITIONS 22 Sheets-Sheet 2 Filed June 19, 1959 wmwJDm 0242200 mmJD .UZ w 2 (2 Tol H. G. WHITEHEAD ALTERATION MEANS FOR PROVIDING INDICATIONS OF REMOTE STATION CONDITIONS 22 Sheets-Sheet I5 PROTECTION SIGNALLING SYSTEM HAVING CHANNEL IMPEDANCE Oct. 26, v1965 Filed June 19, 1959 Oct. 26, 1965 H. G. WHITEHEAD 3,214,734

PROTECTION SIGNALLING SYSTEM HAVING CHANNEL IMPEDANCE ALTERATION MEANS FOR PROVIDING INDIGATIONS OF REMOTE STATION CONDITIONS 22 Sheets-Sheet. 4

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Oct. 26, 1965 H. G. wHlTr-:HEAD

3,234,734 PROTECTION SIGNALLING SYSTEM HAVING CHANNEL IMPEDANGE ALTERATION MEANS FOR PROVIDING INDICATIONS OF REMOTE STATION CONDITIONS Flled June 19, 1959 22 Sheets-Sheet 5 EOPOmFmQ DZDOEO Basil mm IF H. G. WHITEHEAD 3,214,734 PROTECTION SIGNALLING SYSTEM HAVING CHANNEL IMPEDANCE ALTERATION MEANS FOR PROVIDING INDICATIONS OF REMOTE STATION CONDITIONS Filed June 19, 1959 22 Sheets-Sheet 6 Oct. 26, 1965 Ilxlalllllllllllrll'lllllw'lll]|||||||\||l||I||||||||| 1||.|...

OGL 26, 1965 H. G. WHITEHEAD 3,214,734

PROTECTION SIGNALLING SYSTEM HAVING CHANNEL IMPEDANCE ALTERATION MEANS FOR PROVIDING INDICATIONS OF REMOTE STATION CONDITIONS Filed June 19, 1959 22 Sheets-Sheet 7 Oct- 26, 1965 H. G. WHITEHEAD PROTECTION SIGNALLING SYSTEM HAVING CHANNEL MPEDANCE ALTERATION MEANS FOR PROVIDING INDICATIONS OF REMOTE STATION CONDITIONS 22 Sheets-Sheet 8 Filed June 19, 1959 Oct. 26, 1965 H. G. WHITEHEAD 3,214,734

PROTECTION SICNALLINC sYsTEM HAVING CHANNEL IMPEDANCE ALTERATION MEANs FOR PROVIDING INDICATIONs OF REMOTE STATION CONDITIONS Filed June 19, 1959 22 Sheets-$heet 9 INTERROGATION PULSE INTERROGATION PULSE COUNT I COUNT 2 SYNC INFORMATON INTERROGATION -PULSE COUNT O l I l GROUND Cl8 +A F IG i8 Dl-LAY CIRCUIT) 130 moo: 17-31 H. G. WHITEHEAD Oct. 26, 1965 PROTECTION SIGNALLING SYSTEM HAVING CHANNEL IMPEDANCE ALTERATION MEANS FOR PROVIDING INDICATIONS OF REMOTE STATION CONDITIONS 22 Sheets-Sheet 10 Filed June 19, 1959 F I G l2 Lune Driver, D05

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Oct. 26, 1965 H. G. WHITEHEAD 3,214,734

HANNEL IMPEDANCE ALTERATION MEANS FOR PROVIDING INDICATIONS PROTECTION SIGNALLING SYSTEM HAVING O OF REMOTE STATION CONDITIONS 22 Sheets-Sheet 11 Filed June 19, 1959 FIG.I3 Fault Transfer and Conditioning Circuits, ||2 l3-23 Oct. 26, 1965 H. G. wHlTEHEAD 3,214,734

PROTECTION SIGNALLING SYSTEM HAVING CHANNEL IMFEDANCE ALTERATION MEANS FOR PROVIDING INDICATIONS OF REMOTE STATION CONDITIONS Filed June 19, 1959 22 Sheets-Sheet 12 GROUND Oct- 26, 1955 H. G. wHlTEHl-:AD

PROTECTION SIGNALLING SYSTEM HAVING CHANNEL IMPEDNCE ALTERATION MEANS FOR PROVIDING INDICATIONS OF REMOTE STATION CONDITIONS Filed June 19, 1959 F l G l5 Subscriber's Line Detector,

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C- 26, 1965 H. G. WHITEHEAD PROTECTION SIGNALLING SYSTEM HAVING CHANNEL IMPEDANCE ALTERATION MEANS FOR PROVIDING INDICATIONS OF REMOTE STATION CONDITIONS 22 Sheets-Sheet 14 Filed June 19, 1959 F l G I6 Signal Separator, |22

GROUND Oct. 26, 1965 Filed June 19, 1959 H. G. WHITEH EAD FIG.I7

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3,214,734 PROTECTION SIGNALLING SYSTEM HAVING CHANNEL IMPEDANCE ALTERATION MEANS FOR PROVIDING INDICATIONS OF REMOTE STATION CONDITIONS 22 Sheet Pn JQ |25 (o") GROUND was s-Sheet 15 ALARM CONTACTS GRouND H. G. WHITEHEAD 22 Sheecs-Sheet 16 F l G I9 Keying Control, Ill

ALTERATION MEANS FOR PROVIDING INDICATIONS OF REMOTE STATION CONDITIONS PROTECTION SIGNALLING SYSTEM HAVING CHANNEL IMPEDANCE Oct. 26, 1965 Filed June 19, 1959 H. G. WHITEHEAD Oct. 26, 1965 PROTECTION SIGNALLING SYSTEM HAVING CHANNEL IMPEDANCE ALTERATION MEANS FOR PROVIDING INDICATIONS OF REMOTE STATION CONDITIONS 22 Sheets-Sheet 17 Filed June 19, 1959 GROUND FIG.2O

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PROTECTION SIGNALLING SYSTEM HAVING CHANNEL IMPEDANCE ALTERATION MEANS FOR PROVIDING INDICATIONS OF REMOTE STATION CONDITIONS Filed June 19, 1959 22 Sheets-Sheet 18 4Allll n lAllA AAAAA vv vu H. G. WHITEHEAD Oct. 26, 1965 PROTECTION SIGNALLING SYSTEM HAVING CHANNEL IMPEDANCE ALTERATION MEANS FOR PROVIDING INDICATIONS OF REMOTE STATION CONDITIONS 22 Sheets-Sheet 19 Filed June 19, 1959 OGL 26, 1965 H. G. wHxTl-:HEAD 3,214,734

PROTECTION SIGNALLING SYSTEM HAVING CHANNEL IMPEDANCE ALTERATION MEANS FOR PROVIDING INDICATIONS OF REMOTE STATION CONDITIONS Filed June 19, 1959 22 Sheets-Sheet 2O Display Lamp Panel, |l9 r 4V 

1. A SIGNALLING SYSTEM FOR PROVIDING AT ONE LOCATION ELECTRICAL SIGNAL INDICATIONS REPRESENTATIVE OF RESPECTIVE CONDITIONS OF A PLURALITY OF ITEMS LOCATED AT OTHER LOCATIONS AND EACH OF WHICH HAS AT LEAST TWO CONDITIONS, COMPRISING A SOURCE OF A TRAIN OF ELECTRICAL IMPULSES, A COMMUNICATION CHANNEL, MEANS AT SAID ONE LOCATION TO APPLY SAID TRAIN OF ELECTRICAL IMPULSES TO SAID CHANNEL, SIGNALLING MEANS AT EACH OF SAID OTHER LOCATIONS, SAID SIGNALLING MEANS BEING CAPABLE OF BEING RENDERED RESPONSIVE TO THE CONDITIONS OF CORRESPONDING ONES OF SAID ITEMS FOR ACTING UPON SAID CHANNEL BY SELECTIVELY SUBSTANTIALLY DECREASING THE IMPEDANCE OF SAID CHANNEL, SUBSTANTIALLY INCREASING THE IMPEDANCE OF SAID CHANNEL AND LEAVING SUBSTANTIALLY UNCHANGED THE IMPEDANCE OF SAID CHANNEL THEREBY, TO CONVERT SAID IMPULSES INTO DISTINCTIVE SIGNAL INDICATIONS OF THE CONDITIONS OF SAID ITEMS, CONDITIONING MEANS AT EACH OF SAID OTHER LOCATIONS FOR RENDERING THE CORRESPONDING ONES OF SAID OTHER LOCATIONS FOR RENDERING THE THE CONDITIONS OF CORRESPONDING INDIVIDUAL ONES OF SAID ITEMS, COUNTING MEANS AT EACH OF SAID OTHER LOCATIONS AND BEING COUPLED TO SAID CHANNEL FOR COUNTING THE IMPULSES BEING COUPLED TO SAID CHANNEL FOR COUNTING THE IMPULSES IN SAID TRAIN, EACH OF SAID COUNTING MEANS BEING COUPLED BY SAID CONDITIONING MEANS RENDERS THE CORRESPONDING SIGNALLING MEANS RESPONSIVE TO THE CONDITION OF A CORRESPONDING ONE OF SAID ITEMS FOR A PARTICULAR INDIVIDUAL IMPULSE OF SAID TRAIN, AND MEANS AT SAID ONE LOCATION FOR DETECTING SAID DISTINCTIVE SIGNAL INDICATIONS IN SAID CHANNEL. 